Combined carburetor and governor



E929., WQ KNUDSEN COMBINED CARBURETOR AND GOVERNOR Filed sept. 29, 1924 atto: 11e/116 atente Apr. i, i923..`

WILLIAM KN'UDSEN, 0F FREMONT, NEBRASKA.

COMBINED CARBURETOR .AND GOVERNOR.

Application led September 29, 1924. Serial No. 740,651.

- velocity of the gas and is opened by the fil tension of a counter-acting spring regulatable manually so that the speed of the engine may be controlled independently of the governor, while the carburetor is so designed as to produce a uniform and thorough intermining of the component parts of the combustible gas under all conditions. The construction of the carburetor therefore lends itself to the maintenance of a volumetric efficiency throughout all speeds and .under various loads.

A further object is to create and maintain a constancy of atmospheric pressure within the mixing chamber of the carburetor, thus insuring a uniform carlmration irrespective of the variance in the atmospheric pressure due to change in altitude.

Various other objects and advantages of construction as well as the manner of operation of my improved device will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawings, wherein:

Figure 1 is an elevational view of a carburetor constructed in accordance with my invention; partly in section.

Fig. 2 is ay longitudinal sectional view through the device taken substantially on the plane indicated by the line 2-2 in Fig. 1;

Fig. 3 is a horizontal sectional view taken substantially on the plane indicated by line 3 3 of Fig. 1;

Fig. 4 is a horizontal sectional view taken substantially on the plane indicated by the line 4 4 in'Fig. 1; and,

f Fig. 5 is a sectional view taken substantially 011 the plane indicated by lines y5 5 in Fi 1.

Refrring now particularly to the drawings, wherein like reference characters i-ndicate like parts throughout the several figures, it will be noted that the reference character indicates the outletscction of the carburetor suitably flanged as at 11 for cured by means of bolts to the similarly ianged upper edge of the mixing chamber 12, the outer r1m of a throttle valve 22 being `clamped between the flanges. To the lower end of the mixing chamber is bolted a float chamber 13 having a float-.14 which actuatcs a valve 15 disposed in an inlet nipple 16 connected to the source of fuel supply. An air inlet 17 is provided around the fuel inlet 16, which air mixes with the fuel in the mixing hamber 12 in a manner yet to be referred Rigidly iixed to the mixing chamber 12 is a cone-shaped member 1S with which cooperates a movable cone 19, carried by the end of a hollow shaft or stem 20, extending longitudinally of the carburetor casing. This stem is squared as shown at 21, and slidably engages a squared sleeve portion 22 of the throttle valve 22. The stem 20 passes freely through a spider element 23 constituting a seat for the throttle valve 22. The stemV is supported adjacent its lower end bywa central squared portion 23 of an air delecting plate 24, 'which plate, as is apparent from Fig. 2, extends over the upper edges of the cone members 18 and 19. The stem is squared, as shown at 23 so as to slidably engage the dcflecting plate 24. The stem 20 is guided at its upper end by the portion 24 of the carburetor casing. The connection between the stem 20 and the throttle valve 22 and detlecting plate 24 is such as to permit a relative vertical movement of the stem 20, but to cause the parts 22 and 24 to partake in any rotary movement of the stem.

`Wl'icnthe stem 2() is rotated in a manner yetto be described, the inner cone 19, as Well as the deflecting plate 24 are vertically adjusted. For this purpose the upper edge of the outer cone' 18 is formed with a plurality of inclined faces 35, adapted to be engaged by an equal number'of projections or lugs 3G formed on the upper edge of the inner cone 19. Consequently when the inner cone is rotated due to a rotation of the stem 20, the lugs 3G ride upon the inclined faces and adjust the inner cone 19 vertically with reference tothe outer cone. At the same time the delecting plate 24 is vertically adjusted-by means of co-operating slots 37 and pins 38 carried respectively by the plate 24 and` wall of chamber 12. These slots 37 are inclined similarly to the faces 35 and when the plate 24 is rotated, due to a rotation of the stem 20, the slots 37 ride along l the pins 38 to vertically adjust the deflecting a directiontoiclose-thethrottle valve 22. This action is opposed by a spring 29, onel end of which is fixed to the stem while the other' end is fixed to a rotatable collar 30,

t actuated by a manually controlled arm 31.

It is understood that the arm 31 may be controlled by anylmeansjconvenient for the operator. Therefore, whenthe collar 30 is rotated in a direction to increase the tension of the spring 29 a greater velocity must be attained by the gas passin 0F through the carburetor and actingvupon the propeller 28 before the throttle valve 22 thereof will be closed.

In operation, air isl drawn upwardly through the air inlets 17, as indicated by the arrows in Fig. 2, and is deflected by the air deecting plate 24 over the upper edges of the cone members 18.and 19 and in close proximity thereto, thereby picking up fuel supplied to the space between these two members and carrying vit to -the mixing chamber. The fuel and air are thereby brought intimately in'contact and iow upwardly past the throttle valve 22, whereupon the mixture strikes the propeller 28 and, owing to the'pitch of the propellen blades,V tends to rotate the propeller and stem 20 against the action of the spring 29. When a velocity has been attained by the mixture sufficient toA overcome the tension of the spring 29 the throttle valve 22 isn moved toward closed position, thus reducing the flow of the mixture. This will cause the engine to slow down, which, will de crease the vacuum and consequently slow down the velocity of the gas. The propeller blades .will thereby be permitted to return toward their lirst position under the influence of the spring 29. A balance will soon be struck between the velocity of the gas and the 'spring to hold the engine at a uniform speed. y

Rotation of the .stem 20 by the ropeller blades also effects the adjustment o cone 19 and deflector plate 24`as previously described. The adjustment of cone 19 affords' a positive. control of the flow of fuel by the governor. Adjustment of the delicctor plate simultaneously with the throttle yalves causes the pressure in the` mixmg chamber to remain constant. ln carburetors lwhich do not control the air intake port simultaneouslyI with the throttle valve the r'essure in the carbuertor will build up W enthe throttle valve is moved toward closed position', due to the velocity of the air, and willV decrease when the throttle valve is opened again until the velocity of the air has again reached 'its height. closing` the air port simultaneously with and to the same degree as the throttle valve the piling4 up of the air, and consequent building up of pressure is minimized, and the pressure remains substantially. constant. This results in more uniform sucking of the fuel from the jet, with consequent great er uniformity in the mixture and smoother running of the engine, and this result is secured at all engine speeds and at any a1- titude. The pro ortion of fuel and air may be regulated y adjusting the needle valve 25 in the customary manner, it bein to lock this needle valve in its adjusted position by means of a lock nut 27 whereby it moves in direct ratio to and with'the stem 20. The position of the air delecting late 24 insures an intimate intermixing o the air and fuel as the air drawn in throu h possible v the air inlets 17 is directed immediate y over the space between the two cone portions 18 and 19. In this connection it should be.

noted thatthefuel gathered by the air in its' passage throughvv the carburetor is directed by these cone members in an upward di- I `verging directionandin a' relatively thin detail, it will be readily apparent to`those skilled in this art that various modifications and rearrangements of this structure may be resorted to without departing from the spirit and scopevof this invention and to this end reservation is made to make such changes as may come within the purview of the accompanying claims.

Having thus described my invention, what I claim is:

1. In a carburetor havinga mixing chamber, an airinlet ort for said mixing chamber, a fuel nozz e situated within said air inlet port, a deflector plate at said inlet port for directing inliowing air against the mouth of said nozzle, said defiector beingadjustablc relative to said nozzle for varying the size of said inlet port, a throttle valve at the outlet side of said mixing chamber, a governor beyond said throttle dependent upon the velocity of ovv of the mixture, and connections between `said governor, throttle, and deflector, whereby the positions of the throttle and deflector are simultaneously controlled by said governor.

2. In a carburetor having a mixing chamber, an air inlet port for said mixing chamber, an adjustable fuel nozzle situated within said air inlet port, a deflector plate at said inlet port for directing inflowing air against the mouth of said nozzle, said deflector being adjustable relative to said nozzle for varying the size of said inlet port,

a throttle valve at the outlet side of said mixing chamber, a governor beyond said throttle dependentupon the velocity of flow of the mixture, and connections between said governor, throttle, deflector, and nozzle, whereby the positions of said throttle, delector, and the eHective opening of the nozzle are simultaneously controlled by said governor.

The-foregoing specication signed at Fremont, Nebraska, this 21st day of August, 1924.

WILLIAM KNUDSEN. 

